Obsidian

Obsidian

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Credit: BOB GIBBONS/SCIENCE PHOTO LIBRARY

Caption: Obsidian. This pyroclastic material formed when slow-moving, silica-rich lava cooled rapidly. It is also known as volcanic glass. Photographed in California, USA.

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Keywords: american, california, earth science, flow, geological, geology, glass, lava, material, mineraloid, north america, north american, obsidian, obsidian dome, pyroclastic, rock, rocks, sierra nevada, united states, us, usa, volcanic, vulcanism

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